SpringBoot @Autowire why does this example work?

Question

I have created this class:

import org.springframework.stereotype.Component;

...

@Component("notTheNameTestMe") //shouldnt this only work with testMe ?
public class TestMe {

    public void showMsg() {
        System.out.println("Autowiring works");
    }

}

And I'm using it this way in a second class (or better: controller):

import com.example.TestMe; //shouldnt this be not necessary with autowire? But getting error else...

...

@Autowired
private TestMe testMe;

...

this.testMe.showMsg();

But this works perfectly (so maybe Im not really using autowire here?), it even works if I rename the whole TestMe class to TestMeSomething (if I adjust the import in the second class) I dont really understand what @Autowired does. I thought it just scans for SpringBoot Components (which are named by the string in @Component() and when it finds a match it Injects the dependancy. But in my example the match is impossible and I still can see the message "Autowiring works" in the console. This shouldnt be like this if I would really use autowire here or? What am I understanding in a wrong way? What is the difference to using new TestMe() then? I have the dependancy already with the import or? So not a real dependancy injection, or?

see stackoverflow.com/questions/30360589/…

Ori Marko
– Ori Marko

2020-09-13 14:36:01 +00:00
Commented Sep 13, 2020 at 14:36 — Ori Marko
– Ori Marko, Commented Sep 13, 2020 at 14:36

CryptoFool · Accepted Answer · 2020-09-13 14:35:08Z

1

Spring is not operating on the name in the @Component annotation. Rather it's using the name of the class. It's simply finding a class named TestMe because that's the type of the variable you've annotated with @Autowired.

answered Sep 13, 2020 at 14:35

CryptoFool

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